Test Regex for Form Validation

Write and test regular expressions for validating emails, phone numbers, postcodes, and other form inputs.

Tiada log masuk diperlukan

Regular expression

//g

Flags:

Examples:

Test text

Matches

The quick brown fox jumps over the lazy dog. Pack my box with five dozen liquor jugs.Enter a pattern above to see matches highlighted here.

Form Validation tips

📋

Test your validation pattern against both valid and invalid inputs before adding it to your code. Edge cases are easy to miss.

📧

Email validation regex is surprisingly complex. A practical pattern: ^[^\s@]+@[^\s@]+\.[^\s@]+$ — simpler patterns catch most real addresses.

📱

Phone number formats vary by country. Consider whether to validate format or just digits — stricter validation can frustrate international users.

💡

Use named capture groups (?<year>\d{4}) to extract parts of matched strings in your validation code.

Masukkan

Enter your data into the tool above. Everything stays local to your browser.

Proses

The tool processes your data instantly in your browser using JavaScript. No server, no waiting.

Muat turun

Get your result instantly. Nothing is stored after you leave the page — complete privacy.

✓Percuma sepenuhnya — tiada kos tersembunyi, selama-lamanya

✓Tiada akaun, e-mel atau log masuk diperlukan

✓Fail tidak pernah meninggalkan peranti anda

✓Tiada had saiz fail langsung

✓Tiada tera air pada sebarang output

Parse Server Logs with Regex

Write regex patterns to extract timestamps, IP add

Extract and Replace Text with Regex

Use regex to find patterns, extract data, or prepa

Test URL Routing Patterns

Write and test regex patterns for URL routing rule

Extract Data with Regex

Build and test patterns to extract structured data